Fair Value of Assets and Liabilities (FV on recurring basis-Level 3 rollforward) (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Mortgage Servicing Rights, Beginning Balance	$ 1,101	$ 1,268	$ 1,126	$ 1,290
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income	(33)	(56)	(58)	(78)
Fair Value, Mortgage Servicing Rights, Ending Balance	1,068	1,212	1,068	1,212
Fair Value, Mortgage Service Rights, Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Net Derivative Assets and Liabilities, Beginning Balance	80,680	9,175	22,573	4,416
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income	4,290	3,530	10,462	5,243
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale	(5,625)	(2,517)	(9,278)	(4,014)
Variation margin payments for swap liabilities	9,650	9,768	65,238	14,311
Fair Value, Net Derivative Assets and Liabilities, Ending Balance	88,995	19,956	88,995	19,956
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	$ 88,995	$ 19,956	$ 88,995	$ 19,956